<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        [v-cloak] {
  display: none;
}
    </style>
</head>
<body>
    <div id="app">
       <div v-cloak>{{msg}}</div> 
    </div>
    
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
   
    <script>
        
        new Vue({
            el:"#app",
            data:function(){
                return {
                    msg:"hello view"
                }
            }
        });
        let a="hello";
    </script>
   
</body>
</html>